https://repositorio.ufba.br/handle/ufba/498 2026-05-16T08:38:50Z 2026-05-16T08:38:50Z Santos, Tainá Couto dos https://repositorio.ufba.br/handle/ri/44484 2026-05-12T18:37:30Z 2026-02-11T00:00:00Z

Título: Análise espaço-temporal das ilhas de calor urbanas em Salvador (BA) a partir de imagens landsat processadas no google earth engine Autor(es): Santos, Tainá Couto dos Primeiro Orientador: Freiman, Fabiano Peixoto Editora / Evento / Instituição: UNIVERSIDADE FEDERAL DA BAHIA Tipo: Trabalho de Conclusão de Curso

2026-02-11T00:00:00Z Pereira, Tatiane dos Reis Silva Woytysiak https://repositorio.ufba.br/handle/ri/44483 2026-05-12T18:25:10Z 2025-11-06T00:00:00Z

Título: Integração dos princípios do lean office e lean 4.0 na gestão acadêmico-administrativa: uma análise da percepção de valor dos estudantes de pós-graduação Autor(es): Pereira, Tatiane dos Reis Silva Woytysiak Primeiro Orientador: Barbosa, Ava Santana Abstract: The main objective of this study is to investigate how the integration of Lean Office principles and Industry 4.0 digital technologies can contribute to improving the quality and efficiency of academic and administrative management at higher education institutions, focusing on graduate students' perceptions of value. The research is based on the premise that the student experience is influenced by value attributes that can be optimized through lean practices and digital technologies. The methodology adopted is both qualitative and quantitative, involving a focus group followed by the administration of structured questionnaires and multivariate statistical analysis, highlighting the use of Principal Component Analysis to identify the latent structure of perceived value attributes. The data collected allowed us to map relevant dimensions of the academic and administrative experience, such as agility, reliability, accessibility, and personalized services. The results reveal that incorporating Lean 4.0 practices can promote significant gains in institutional efficiency, academic sustainability, and student satisfaction. Editora / Evento / Instituição: Universidade Federal da Bahia Tipo: Dissertação

2025-11-06T00:00:00Z Lima, Danilo Carvalho de https://repositorio.ufba.br/handle/ri/44434 2026-04-30T13:50:59Z 2026-03-03T00:00:00Z

Título: Avaliação das propriedades físico-mecânicas e reológicas de compósitos de cimento de fosfato de magnésio com adição de fibras de aço, de sisal (agave sisalana) e de pva Autor(es): Lima, Danilo Carvalho de Primeiro Orientador: Ribeiro, Daniel Véras Abstract: Magnesium phosphate cement (MPC) is an acid-base binder with superior physical mechanical properties compared to conventional hydraulic cements, yet it still presents many gaps, aiming at its development and wider application. This study evaluates the physical, mechanical, and rheological performance of MPC composites reinforced with PVA, sisal, and steel fibers in different proportions, aiming to reduce the brittleness and low deformability of the cementitious matrix. The MPC raw materials (calcined MgO, ammonium dihydrogen monophosphate - ADP, sodium tripolyphosphate – STP, and boric acid), sand, and steel (metallic), polymeric (PVA), and sisal (vegetable) fibers were characterized in terms of physical, chemical, and mineralogical aspects to optimize the formulation and allow evaluations of the composites in the fresh and hardened states. In the fresh state, setting time, pH, calorimetry, and rheological analysis tests were performed on the reference matrix and samples with different fiber contents. After molding and curing, the samples were subjected to phase formation analysis by XRD and thermogravimetry (TG/DTA), in addition to physical-mechanical analysis (specific mass, apparent porosity, capillary absorption, dimensional stability, axial compressive strength, and flexural tensile strength). The results showed that the addition of steel fibers to the CFM promoted significant gains in flexural tensile strength and compressive strength, with emphasis on the increase in toughness, evaluated by the I10 factor, indicating a more ductile post-cracking behavior and an efficient redistribution of stresses. While the addition of natural fibers to the composites resulted in a loss of mechanical performance, contributing to reduced strength values and increased variability in results, possibly due to high water absorption and low interfacial adhesion with the matrix, the chemical acetylation treatment showed promise in improving the mechanical properties of CFM composites with sisal fibers. The insertion of PVA fibers into the CFM matrix provided a modest improvement in mechanical strength compared to the reference matrix and superior performance to that of composites containing natural sisal fibers. Editora / Evento / Instituição: UNIVERSIDADE FEDERAL DA BAHIA Tipo: Dissertação

2026-03-03T00:00:00Z Melo, Luciana Lima https://repositorio.ufba.br/handle/ri/44432 2026-04-29T18:48:32Z 0002-02-27T00:00:00Z

Título: Modificação da fibra da luffa cylindrica (l. aegyptiacal) com ácidos graxos para aplicação como biossorvente de óleo diesel Autor(es): Melo, Luciana Lima Primeiro Orientador: Vidal, Rosangela Regia Lima Abstract: The high demand for and widespread use of petroleum and its derivatives, such as diesel oil, across various economic sectors have caused significant impacts on the environment and human health. In the environment, these compounds have become major pollutants, primarily due to spills. In this context, sorption processes emerge as a promising alternative for removing oily pollutants from water, underscoring the need for biodegradable, low-cost, and highly efficient materials. Luffa cylindrica fiber (vegetable sponge) shows potential as a biosorbent due to its porous structure and mechanical stability. However, its sorptive capacity still requires improvement. Thus, this work proposes the surface modification of Luffa cylindrica fiber with fatty acids (lauric, palmitic, stearic, oleic, and linoleic acids) to increase its affinity for oily compounds. The main objective was to evaluate the effect of these modifications on the sorption capacity of diesel oil. Sample characterization was performed using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). Sorption studies were conducted by varying sorbent mass, process time, agitation speed, and temperature. Batch experiments were carried out using reference systems (diesel oil, distilled water, or saline water) and systems containing diesel oil spilled into distilled or saline water. The results indicated that oleic acid modification provided the most significant increase in diesel oil sorption capacity among the evaluated systems. The pseudo-second-order model showed the best fit to the kinetic data, indicating that the process is controlled by surface interactions. The predominant mechanism is driven primarily by hydrophobic interactions and van der Waals forces, reflecting the nonpolar affinity between diesel oil and the modified fiber surface. It is concluded that modifying Luffa cylindrica fiber with oleic acid increases its hydrophobicity and sorption efficiency, highlighting the material's potential for oil spill remediation. Editora / Evento / Instituição: Universidade Federal da Bahia Tipo: Dissertação

0002-02-27T00:00:00Z